React Native Video component 설계 Background Timer Expo Firebase Dev TS Timer 타이머 만들기 useState 만들어보기 FCM Background Notification react eas-cli local error webview camera React Native Timer js closure JS TImer ios notification json chrome extension ios certificate ios Background Notification React Native Background Notificaiton UX eas-cli error react native Android Firebase Dev webview video Background Notification iOS Firebase Dev javascript [RUN FASTLANE] Exit status: 65